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A good seller, sells to buyers emotions, a good buyers buys based on sellers reasons (sort of).

Trying to come up with a one liner, I hope you get the gist. Seller should have good EQ and buyers should be dispassionate.

Only half of your equation, but how about Baron Rothschild's "The time to buy is when there's blood in the streets."

or buffett, "be fearful when others are greedy, and greedy when others are fearful."

So, good sellers appeal to bad buyers.